Slumping is a kilnforming process that uses heat and gravity to transform sheet glass into the shape of a mold. One can to create an almost endless variety of forms when slumping glass.

When the glass is heated in a kiln and enters a liquid state, the force of gravity pulls it to the bottom of a mold or kiln shelf.

After the heated glass has flowed into the mold and assumed its shape, it is cooled back down to room temperature with an appropriate annealing phase. By the time the glass is fully returned to room temperature the liquid glass will be crystallized into the rigid form of glass with which we are most familiar. Its new permanent shape will be that of the mold.

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Fusing is the technique of joining two or more pieces of glass by heat in a kiln. There are different glass fusing techniques. For example, “tack fusing” is a fusing technique in which the pieces of glass are heated until they are just hot enough to stick together and retain many of their own original characteristics. In a full fuse, on the other hand, glass is heated until it becomes molten.